/**
 * This file is part of 1genia trampoline
 * Copyright (C) 2007 1genia (contact@1genia.com)
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; version 3 of the License. 
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details. 
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; see the file COPYING.TXT.  If not,
 * write to the Free Software Foundation, Inc., 51 Franklin Street,
 * Fifth Floor, Boston, MA 02110-1301, USA. 
 **/
package com.genia.toolbox.basics.manager.impl;

import java.util.Stack;

import com.genia.toolbox.basics.manager.ByteArrayProvider;

/**
 * Default implementation of <code>ByteArrayProvider</code>.
 * 
 * @see com.genia.toolbox.basics.manager.ByteArrayProvider
 */
public class ByteArrayProviderImpl
    implements ByteArrayProvider
{

  /**
   * size of the arrays generated.
   */
  private static final int SIZE = 2048;

  /**
   * pool of arrays.
   */
  private transient final Stack<byte[]> arrays = new Stack<byte[]>();



  /**
   * returns a new byte array to be used by the application.
   * 
   * @return a new byte array to be used by the application.
   * @see com.genia.toolbox.basics.manager.ByteArrayProvider#getArray()
   */
  public byte[] getArray()
  {
    synchronized (this) {
      if (!arrays.isEmpty()) {
        return arrays.pop();
      }
      return new byte[SIZE];
    }
  }



  /**
   * release a byte array obtained by this manager, so that it can be reused.
   * 
   * @param array
   *          the array to release
   * @see com.genia.toolbox.basics.manager.ByteArrayProvider#release(byte[])
   */
  public void release(final byte[] array)
  {
    synchronized (this) {
      arrays.push(array);
    }
  }

}
